{"id":"CVE-2026-75628","state":"PUBLISHED","title":"Punk::OAuth2 versions before 0.03 for Perl allow an attacker-chosen off-site redirect after login because same_origin_path accepts a backslash or tab in the return parameter","description":"Punk::OAuth2 versions before 0.03 for Perl allow an attacker-chosen off-site redirect after login because same_origin_path accepts a backslash or tab in the return parameter.\n\noauth2_login reads the return parameter from the initiation request, runs same_origin_path over it, and stores the survivor in the session flow record as the post-login redirect target. That check rejects a value that does not begin with a slash, one with a slash as its second byte, and one containing CR or LF. A backslash and a tab pass. The URL Standard treats a backslash as equivalent to a slash for special schemes, so `/\\evil.example` parses with the authority `evil.example`. It also strips ASCII tab before parsing, so a tab between two leading slashes leaves `//evil.example`.\n\nA crafted link to the application's own login route lands the victim on the attacker's site after a genuine authentication. The redirect carries no authorization code or access token.","publishedAt":"2026-08-20T00:40:08.220Z","updatedAt":"2026-10-19T21:19:28.700Z","severity":{"score":5.7,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","source":"CISA-ADP"},"assigner":"CPANSec","products":["Punk-OAuth2"],"affected":[{"packageName":"Punk-OAuth2","packageURL":"pkg:cpan/Punk-OAuth2","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.03","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","modules":["Punk::OAuth2"],"programFiles":["include/pox/pox_util.h","lib/Punk/Plugin/OAuth2.pm"],"programRoutines":[{"name":"Punk::OAuth2::same_origin_path"}]}],"references":["https://metacpan.org/release/LNATION/Punk-OAuth2-0.03/changes","https://metacpan.org/release/LNATION/Punk-OAuth2-0.02/source/include/pox/pox_util.h#L94","https://datatracker.ietf.org/doc/html/rfc9700#section-4.11.1","https://url.spec.whatwg.org/#relative-slash-state","https://url.spec.whatwg.org/#concept-basic-url-parser","http://www.openwall.com/lists/oss-security/2026/08/20/1"],"weaknesses":["CWE-601"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/75xxx/CVE-2026-75628.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-75628","state":"PUBLISHED","datePublished":"2026-08-20T00:40:08.220Z","dateUpdated":"2026-10-19T21:19:28.700Z","assignerShortName":"CPANSec","assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateReserved":"2026-08-18T01:18:00.649Z"},"containers":{"cna":{"title":"Punk::OAuth2 versions before 0.03 for Perl allow an attacker-chosen off-site redirect after login because same_origin_path accepts a backslash or tab in the return parameter","descriptions":[{"lang":"en","value":"Punk::OAuth2 versions before 0.03 for Perl allow an attacker-chosen off-site redirect after login because same_origin_path accepts a backslash or tab in the return parameter.\n\noauth2_login reads the return parameter from the initiation request, runs same_origin_path over it, and stores the survivor in the session flow record as the post-login redirect target. That check rejects a value that does not begin with a slash, one with a slash as its second byte, and one containing CR or LF. A backslash and a tab pass. The URL Standard treats a backslash as equivalent to a slash for special schemes, so `/\\evil.example` parses with the authority `evil.example`. It also strips ASCII tab before parsing, so a tab between two leading slashes leaves `//evil.example`.\n\nA crafted link to the application's own login route lands the victim on the attacker's site after a genuine authentication. The redirect carries no authorization code or access token."}],"affected":[{"packageName":"Punk-OAuth2","packageURL":"pkg:cpan/Punk-OAuth2","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.03","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","modules":["Punk::OAuth2"],"programFiles":["include/pox/pox_util.h","lib/Punk/Plugin/OAuth2.pm"],"programRoutines":[{"name":"Punk::OAuth2::same_origin_path"}]}],"references":[{"url":"https://metacpan.org/release/LNATION/Punk-OAuth2-0.03/changes","tags":["release-notes"]},{"url":"https://metacpan.org/release/LNATION/Punk-OAuth2-0.02/source/include/pox/pox_util.h#L94","tags":["technical-description"]},{"url":"https://datatracker.ietf.org/doc/html/rfc9700#section-4.11.1","tags":["technical-description"]},{"url":"https://url.spec.whatwg.org/#relative-slash-state","tags":["technical-description"]},{"url":"https://url.spec.whatwg.org/#concept-basic-url-parser","tags":["technical-description"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-601","description":"CWE-601 URL Redirection to Untrusted Site ('Open Redirect')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CPANSec","orgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateUpdated":"2026-08-20T00:40:08.220Z"},"solutions":[{"lang":"en","value":"Upgrade to Punk-OAuth2 0.03 or later."}],"source":{"discovery":"UNKNOWN"},"workarounds":[{"lang":"en","value":"For deployments that cannot upgrade to 0.03, strip the return query parameter from requests to the oauth2_login initiation route at the reverse proxy. Logins then use the configured redirect_ok destination."}],"x_generator":{"engine":"cpansec-cna-tool 0.1"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/08/20/1"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-08-20T02:25:36.019Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.7,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","integrityImpact":"NONE","userInteraction":"REQUIRED","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"id":"CVE-2026-75628","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-08-28T15:11:05.001417Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-601","lang":"en","type":"CWE","description":"CWE-601 URL Redirection to Untrusted Site ('Open Redirect')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T21:19:28.700Z"}}]}}}